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Date: Sun, 3 Jul 2022 18:22:03 +0300
From: Oleksandr <olekstysh@...il.com>
To: Samuel Holland <samuel@...lland.org>
Cc: Marc Zyngier <maz@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Bartosz Golaszewski <brgl@...ev.pl>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Borislav Petkov <bp@...en8.de>,
Broadcom internal kernel review list
<bcm-kernel-feedback-list@...adcom.com>,
Chris Zankel <chris@...kel.net>,
Colin Ian King <colin.king@...el.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Dexuan Cui <decui@...rosoft.com>,
Florian Fainelli <f.fainelli@...il.com>,
Guo Ren <guoren@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Helge Deller <deller@....de>, Ingo Molnar <mingo@...hat.com>,
Ivan Kokshaysky <ink@...assic.park.msu.ru>,
"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
Jan Beulich <jbeulich@...e.com>,
Joerg Roedel <joro@...tes.org>,
Juergen Gross <jgross@...e.com>,
Julia Lawall <Julia.Lawall@...ia.fr>,
"K. Y. Srinivasan" <kys@...rosoft.com>,
Kees Cook <keescook@...omium.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Linus Walleij <linus.walleij@...aro.org>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Matt Turner <mattst88@...il.com>,
Max Filippov <jcmvbkbc@...il.com>,
Maximilian Heyne <mheyne@...zon.de>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
Rich Felker <dalias@...c.org>,
Richard Henderson <rth@...ddle.net>,
Rikard Falkeborn <rikard.falkeborn@...il.com>,
Rob Herring <robh@...nel.org>,
Russell King <linux@...linux.org.uk>,
Serge Semin <fancer.lancer@...il.com>,
Stefano Stabellini <sstabellini@...nel.org>,
Stephen Hemminger <sthemmin@...rosoft.com>,
Sven Schnelle <svens@...ckframe.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Wei Liu <wei.liu@...nel.org>, Wei Xu <xuwei5@...ilicon.com>,
Will Deacon <will@...nel.org>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
iommu@...ts.linux-foundation.org, iommu@...ts.linux.dev,
linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-hyperv@...r.kernel.org, linux-ia64@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
linux-parisc@...r.kernel.org, linux-pci@...r.kernel.org,
linux-sh@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
x86@...nel.org, xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v3 6/8] genirq: Add and use an irq_data_update_affinity
helper
On 01.07.22 23:00, Samuel Holland wrote:
Hello Samuel
> Some architectures and irqchip drivers modify the cpumask returned by
> irq_data_get_affinity_mask, usually by copying in to it. This is
> problematic for uniprocessor configurations, where the affinity mask
> should be constant, as it is known at compile time.
>
> Add and use a setter for the affinity mask, following the pattern of
> irq_data_update_effective_affinity. This allows the getter function to
> return a const cpumask pointer.
>
> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
>
> Changes in v3:
> - New patch to introduce irq_data_update_affinity
>
> arch/alpha/kernel/irq.c | 2 +-
> arch/ia64/kernel/iosapic.c | 2 +-
> arch/ia64/kernel/irq.c | 4 ++--
> arch/ia64/kernel/msi_ia64.c | 4 ++--
> arch/parisc/kernel/irq.c | 2 +-
> drivers/irqchip/irq-bcm6345-l1.c | 4 ++--
> drivers/parisc/iosapic.c | 2 +-
> drivers/sh/intc/chip.c | 2 +-
> drivers/xen/events/events_base.c | 7 ++++---
> include/linux/irq.h | 6 ++++++
> 10 files changed, 21 insertions(+), 14 deletions(-)
>
> diff --git a/arch/alpha/kernel/irq.c b/arch/alpha/kernel/irq.c
> index f6d2946edbd2..15f2effd6baf 100644
> --- a/arch/alpha/kernel/irq.c
> +++ b/arch/alpha/kernel/irq.c
> @@ -60,7 +60,7 @@ int irq_select_affinity(unsigned int irq)
> cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
> last_cpu = cpu;
>
> - cpumask_copy(irq_data_get_affinity_mask(data), cpumask_of(cpu));
> + irq_data_update_affinity(data, cpumask_of(cpu));
> chip->irq_set_affinity(data, cpumask_of(cpu), false);
> return 0;
> }
> diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
> index 35adcf89035a..99300850abc1 100644
> --- a/arch/ia64/kernel/iosapic.c
> +++ b/arch/ia64/kernel/iosapic.c
> @@ -834,7 +834,7 @@ iosapic_unregister_intr (unsigned int gsi)
> if (iosapic_intr_info[irq].count == 0) {
> #ifdef CONFIG_SMP
> /* Clear affinity */
> - cpumask_setall(irq_get_affinity_mask(irq));
> + irq_data_update_affinity(irq_get_irq_data(irq), cpu_all_mask);
> #endif
> /* Clear the interrupt information */
> iosapic_intr_info[irq].dest = 0;
> diff --git a/arch/ia64/kernel/irq.c b/arch/ia64/kernel/irq.c
> index ecef17c7c35b..275b9ea58c64 100644
> --- a/arch/ia64/kernel/irq.c
> +++ b/arch/ia64/kernel/irq.c
> @@ -57,8 +57,8 @@ static char irq_redir [NR_IRQS]; // = { [0 ... NR_IRQS-1] = 1 };
> void set_irq_affinity_info (unsigned int irq, int hwid, int redir)
> {
> if (irq < NR_IRQS) {
> - cpumask_copy(irq_get_affinity_mask(irq),
> - cpumask_of(cpu_logical_id(hwid)));
> + irq_data_update_affinity(irq_get_irq_data(irq),
> + cpumask_of(cpu_logical_id(hwid)));
> irq_redir[irq] = (char) (redir & 0xff);
> }
> }
> diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
> index df5c28f252e3..025e5133c860 100644
> --- a/arch/ia64/kernel/msi_ia64.c
> +++ b/arch/ia64/kernel/msi_ia64.c
> @@ -37,7 +37,7 @@ static int ia64_set_msi_irq_affinity(struct irq_data *idata,
> msg.data = data;
>
> pci_write_msi_msg(irq, &msg);
> - cpumask_copy(irq_data_get_affinity_mask(idata), cpumask_of(cpu));
> + irq_data_update_affinity(idata, cpumask_of(cpu));
>
> return 0;
> }
> @@ -132,7 +132,7 @@ static int dmar_msi_set_affinity(struct irq_data *data,
> msg.address_lo |= MSI_ADDR_DEST_ID_CPU(cpu_physical_id(cpu));
>
> dmar_msi_write(irq, &msg);
> - cpumask_copy(irq_data_get_affinity_mask(data), mask);
> + irq_data_update_affinity(data, mask);
>
> return 0;
> }
> diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
> index 0fe2d79fb123..5ebb1771b4ab 100644
> --- a/arch/parisc/kernel/irq.c
> +++ b/arch/parisc/kernel/irq.c
> @@ -315,7 +315,7 @@ unsigned long txn_affinity_addr(unsigned int irq, int cpu)
> {
> #ifdef CONFIG_SMP
> struct irq_data *d = irq_get_irq_data(irq);
> - cpumask_copy(irq_data_get_affinity_mask(d), cpumask_of(cpu));
> + irq_data_update_affinity(d, cpumask_of(cpu));
> #endif
>
> return per_cpu(cpu_data, cpu).txn_addr;
> diff --git a/drivers/irqchip/irq-bcm6345-l1.c b/drivers/irqchip/irq-bcm6345-l1.c
> index 142a7431745f..6899e37810a8 100644
> --- a/drivers/irqchip/irq-bcm6345-l1.c
> +++ b/drivers/irqchip/irq-bcm6345-l1.c
> @@ -216,11 +216,11 @@ static int bcm6345_l1_set_affinity(struct irq_data *d,
> enabled = intc->cpus[old_cpu]->enable_cache[word] & mask;
> if (enabled)
> __bcm6345_l1_mask(d);
> - cpumask_copy(irq_data_get_affinity_mask(d), dest);
> + irq_data_update_affinity(d, dest);
> if (enabled)
> __bcm6345_l1_unmask(d);
> } else {
> - cpumask_copy(irq_data_get_affinity_mask(d), dest);
> + irq_data_update_affinity(d, dest);
> }
> raw_spin_unlock_irqrestore(&intc->lock, flags);
>
> diff --git a/drivers/parisc/iosapic.c b/drivers/parisc/iosapic.c
> index 8a3b0c3a1e92..3a8c98615634 100644
> --- a/drivers/parisc/iosapic.c
> +++ b/drivers/parisc/iosapic.c
> @@ -677,7 +677,7 @@ static int iosapic_set_affinity_irq(struct irq_data *d,
> if (dest_cpu < 0)
> return -1;
>
> - cpumask_copy(irq_data_get_affinity_mask(d), cpumask_of(dest_cpu));
> + irq_data_update_affinity(d, cpumask_of(dest_cpu));
> vi->txn_addr = txn_affinity_addr(d->irq, dest_cpu);
>
> spin_lock_irqsave(&iosapic_lock, flags);
> diff --git a/drivers/sh/intc/chip.c b/drivers/sh/intc/chip.c
> index 358df7510186..828d81e02b37 100644
> --- a/drivers/sh/intc/chip.c
> +++ b/drivers/sh/intc/chip.c
> @@ -72,7 +72,7 @@ static int intc_set_affinity(struct irq_data *data,
> if (!cpumask_intersects(cpumask, cpu_online_mask))
> return -1;
>
> - cpumask_copy(irq_data_get_affinity_mask(data), cpumask);
> + irq_data_update_affinity(data, cpumask);
>
> return IRQ_SET_MASK_OK_NOCOPY;
> }
> diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
> index 46d9295d9a6e..5e8321f43cbd 100644
> --- a/drivers/xen/events/events_base.c
> +++ b/drivers/xen/events/events_base.c
> @@ -528,9 +528,10 @@ static void bind_evtchn_to_cpu(evtchn_port_t evtchn, unsigned int cpu,
> BUG_ON(irq == -1);
>
> if (IS_ENABLED(CONFIG_SMP) && force_affinity) {
> - cpumask_copy(irq_get_affinity_mask(irq), cpumask_of(cpu));
> - cpumask_copy(irq_get_effective_affinity_mask(irq),
> - cpumask_of(cpu));
> + struct irq_data *data = irq_get_irq_data(irq);
> +
> + irq_data_update_affinity(data, cpumask_of(cpu));
> + irq_data_update_effective_affinity(data, cpumask_of(cpu));
> }
Nit: commit description says about reusing irq_data_update_affinity()
only, but here we also reuse irq_data_update_effective_affinity(), so I
would mention that in the description.
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com> # Xen bits
[snip]
--
Regards,
Oleksandr Tyshchenko
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